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IGB(4) FreeBSD Kernel Interfaces Manual IGB(4)
NAMEigb -- Intel(R) PRO/1000 PCI Express Gigabit Ethernet adapter driver
SYNOPSIS
To compile this driver into the kernel, place the following line in your
kernel configuration file:
deviceigb
Alternatively, to load the driver as a module at boot time, place the
following line in loader.conf(5):
if_igb_load="YES"
DESCRIPTION
The igb driver provides support for PCI Express Gigabit Ethernet adapters
based on the Intel 82575 and 82576 Ethernet controller chips. The driver
supports Transmit/Receive checksum offload and Jumbo Frames. Furthermore
it supports TCP segmentation offload (TSO) on all adapters. The identi-
fication LEDs of the adapters supported by the igb driver can be con-
trolled via the led(4) API for localization purposes.
For questions related to hardware requirements, refer to the documenta-
tion supplied with your Intel PRO/1000 adapter. All hardware require-
ments listed apply to use with FreeBSD.
Support for Jumbo Frames is provided via the interface MTU setting.
Selecting an MTU larger than 1500 bytes with the ifconfig(8) utility con-
figures the adapter to receive and transmit Jumbo Frames. The maximum
MTU size for Jumbo Frames is 9216.
This driver supports hardware assisted VLANs. The igb driver supports
the following media types:
autoselect Enables auto-negotiation for speed and duplex.
10baseT/UTP Sets 10Mbps operation. Use the mediaopt option to select
full-duplex mode.
100baseTX Sets 100Mbps operation. Use the mediaopt option to select
full-duplex mode.
1000baseSX Sets 1000Mbps operation. Only full-duplex mode is supported
at this speed.
1000baseTX Sets 1000Mbps operation. Only full-duplex mode is supported
at this speed.
The igb driver supports the following media options:
full-duplex Forces full-duplex operation
half-duplex Forces half-duplex operation.
Only use mediaopt to set the driver to full-duplex. If mediaopt is not
specified, the driver defaults to half-duplex.
For more information on configuring this device, see ifconfig(8).
HARDWARE
The igb driver supports Gigabit Ethernet adapters based on the Intel
82575 and 82576 controller chips:
+o Intel Gigabit ET Dual Port Server Adapter (82576)
+o Intel Gigabit VT Quad Port Server Adapter (82575)
LOADER TUNABLES
Tunables can be set at the loader(8) prompt before booting the kernel or
stored in loader.conf(5).
hw.igb.rxd
Number of receive descriptors allocated by the driver. The
default value is 256. The minimum is 80, and the maximum is
4096.
hw.igb.txd
Number of transmit descriptors allocated by the driver. The
default value is 256. The minimum is 80, and the maximum is
4096.
hw.igb.enable_aim
If set to 1, enable Adaptive Interrupt Moderation. The default
is to enable Adaptive Interrupt Moderation.
hw.igb.num_queues
Number of queues used for data transfer. If set to 0, number of
queues will be configured automatically based on number of CPUs
and max supported MSI-X messages on the device.
kern.ipc.nmbclusters
The maximum number of mbuf clusters allowed. If the system has
more than one igb card or jumbo frames are enabled, this value
will need to be increased.
kern.ipc.nmbjumbo9k
The maximum number of mbuf 9k jumbo clusters allowed. Increasing
this to allow for at least 8192 extra clusters per interface can
allow for an mtu of 8192.
FILES
/dev/led/igb* identification LED device nodes
EXAMPLES
Make the identification LED of igb0 blink:
echo f2 > /dev/led/igb0
Turn the identification LED of igb0 off again:
echo 0 > /dev/led/igb0
DIAGNOSTICSigb%d:Unabletoallocatebusresource:memory A fatal initialization
error has occurred.
igb%d:Unabletoallocatebusresource:interrupt A fatal initialization
error has occurred.
igb%d:watchdogtimeout--resetting The device has stopped responding
to the network, or there is a problem with the network connection
(cable).
SUPPORT
For general information and support, go to the Intel support website at:
http://support.intel.com.
If an issue is identified with the released source code on the supported
kernel with a supported adapter, email the specific information related
to the issue to <freebsdnic@mailbox.intel.com>.
SEE ALSOaltq(4), arp(4), em(4), led(4), netintro(4), ng_ether(4), polling(4),
vlan(4), ifconfig(8)HISTORY
The igb device driver first appeared in FreeBSD 7.1.
AUTHORS
The igb driver was written by Intel Corporation
<freebsdnic@mailbox.intel.com>.
FreeBSD 10.1 March 25, 2013 FreeBSD 10.1